Water-soluble disazo dyestuffs and their complex metal compounds



United States Patent Int. 01. C691) 29/02 U.S. Cl. 260-147 6 Claims ABSTRACT OF THE DISCLOSURE Water-soluble disazo-dyestuffs and copper, cobalt, chromium, nickel, and iron complex compounds thereof having the formula wherein Ar is benzene or naphthalene, Ar and Ar are benzene, naphthalene, benzene-sulfonic acids, naphthalene-sulfonic acids, lower alkoxybenzenes, nitrobenzenes, nitrobenzene-sulfonic acids, lower alkoxy-nitrobenzenesulfonic acids or chlorobenzene-sulfonic acids, R is hydrogen or lower alkyl, R is lower alkyl, phenyl, COOH or COO-lower alkyl, R;, is hydrogen, hydroxyl, carboxyl or lower alkoxy, X is sulfonyl or carbonyl, Z is ,B-chloroethyl, fi-sulfatoethyl, fi-phosphatoethyl or vinyl, and n and m are integers from 1 to 2, at least one m being 2, the substituents R in Ar and OH in Ar being in o-position to the adjacent azo groups.

The present invention provides new Water-soluble disazo dyestuffs, their complex metal compounds and a process for preparing them; more particularly, the present invention provides a water-soluble disazo-dyestulf of the formula 3,450,689 Patented June 17, 1969 wherein Ar represents a benzene or naphthalene radical, Ar and Ar represent radicals of benzene, naphthalene, benzene-sulfonic acids, naphthalene-sulfonic acids, lower alkoxybenzenes, nitrobenzenes, nitrobenzene-sulfonic acids, lower alkoxy-nitrobenzenesulfonic acids and chlorobenzene-sulfonic acids, R represents hydrogen or lower alkyl, R represents lower alkyl, phenyl, COOH or COO-lower alkyl, R represents hydrogen, hydroxy], carboxyl or lower alkoxy, X represents sulfonyl or carbonyl, Z represents fl-chloro-ethyl, ,B-sulfatoethyl, fl-phosphatoethyl or vinyl, n and m represent integers from 1 to 2, at least one m being 2, and wherein the substituents R in Ar and OH in Ar are linked in o-position to the azo group.

The above-specified water-soluble disazo dyestuifs and their complex metal compounds can be prepared by coupling, simultaneously or consecutively, 2 mols of identical or difi erent aromatic diazo compounds of which at least one contains at least once the group in which Ar represents a benzene or naphthalene radical containing at least 1 sulfonic acid group, R represents a hydrogen atom or an acyl radical, and R represents an alkyl, aryl, carboxyl or carboxylic acid ester radical, and in case coupling components are used in which R represents an acyl radical, allowing the second mol of the diazo compound to react only after having split oif the acyl radical by hydrolysis, and in those of the disazo dyestuffs obtained which contain a hydroxy group within the groups of the Formula 1, esterifying the alcoholic hydroxy group by treatment with polybasic acids, the monoamides or monochlorides thereof, and if desired, treating with metal donors the disazo dyestuffs obtained, if they contain groups that form metal complexes or groups which are convertible into groups that form metal complexes.

The disazo dyestufis obtained according to the process of the present invention and which contain groups of the Formula 1 can be converted by treatment with aqueous alkaline agents into disazo-dyestuifs containing groups of the Formula 2; however, this treatment is carried out after esterification of the hydroxy group, if Y in the Formula 1 represents such a hydroxy group.

For preparing the new disazo dyestuifs, there may be used as diazo components, for example, l-aminobenzene- 4-fl-hydroxy-ethyl-sulfone-sulfuric acid ester, l-aminobenzene 4 vinylsulfone, 1 aminobenzene 3 flchloroethylsulfone, 1 amino 2 hydroxy ,8 hydroxyethylsulfone-sulfuric acid ester, 1-amino-2-hydroxybenzene 5 ,8 hydroxyethylsulfone, 1 amino 2 hydroxy 4 3 hydroxyethylbenzenesulfone-sulfuric acid ester, 1 amino 2 hydroxy 5 N methyl ethionylaminobenzene, 1 amino 4 acroylaminobenzene 2- sulfonic acid, 1 amino 3 [3 chloropropionyl-aminobenzene, 1 amino 2 hydroxy 6 -nitro-naphthalene- 4 sulfonic acid, 1 amino naphthalene 4 sulfonic acid or 1 amino naphthalene 5 [3 hydroxyethylsultone-sulfuric acid ester.

For preparing disazo dyestuffs which contain only 1 reactive group of the above indicated Formula 1 or 2, there may be used as the first or second diazo component any other aromatic amines such, for example, as aminobenzene, anthranilic acid and derivatives of o-aminophenol, naphthyl-amine or o-aminonaphthol.

As coupling components, there are suitable for example, the following compounds:

1- 8-hydroxy-6-sulfo-2-naphthyl -3-methylpyrazolone- 5 1- (5 '-hydroxy-7 -sulfo-l -naphthyl -3 methyl-pyrazolone-( 5 1- 5 -hydroxy-7'-sulfo-2'-naphthyl -3-methyl-pyrazolone-(S 1- 8'-hydroxy-6'-sulfo-2'-naphthyl) -3 -phenyl-pyrazolone- (5 l- 3-hydroxy-4'-sulfol '-pheny1) -3-methyl-pyrazolone- (5 1- 8'-hydroxy-6'-sulfo-2'-naphthyl -pyrazolone- 5 3-carboxylic acid,

1- 8-p-toluenesulfonyloxy-6'-sulfo-2'-naphthyl) -3 methylpyrazolone- (5 Diazo components with a low coupling energy, for example, o-aminophenol or o-aminonaphthol derivatives or Z-aminobenzoic acid, can be coupled only once with the coupling components of the above-indicated formula in which R represents a hydrogen atom, when working in a Weakly acid medium. In this case, monoazo dyestufis can be isolated which contain the diazo component at the pyrazolone nucleus. When diazo components that have .a higher coupling energy are used, for example, aniline-sulfonic acids or anilines which are substituted by other acid radicals, the preparation of the monoazo dyestuffs succeeds in many cases only when protecting by acylation, for example with p-toluene sulfochloride, the naphtholic hydroxy group and hydrolysing it after coupling. By further coupling with another diazotized amine,

it is then possible, suitably in a neutral or weakly alkaline medium, to prepare disazo dyestuifs which contain two different diazo components.

If the dyestuffs contain metallizable groups such, for example, as two hydroxy or hydroxy-carboxy groups to o,o'-position to an azo group or groups which are con vertible into such groups, they can be transformed in known manner into complex metal compounds. As metal donors, there may be used compounds of copper, nickel, cobalt, chromium or iron. Disazo dyestuffs with diflerent complex bound metals can be prepared by metallization of the primarily prepared monoazo dyestuffs, further coupling to yield disazo dyestuffs and further treatment with another metal donor.

The new dyestuffs are suitable for the dyeing and printing of fibrous materials of any kind, for example, materials of native or regenerated cellulose, wool, silk or polyamide. They can be fixed onto the fibrous material in the presence of agents having an alkaline action or of agents which give off alkali upon heating, at room temperature or at an elevated temperature. The dyestuffs of the present invention are distinguished by good to very good fastness to wetting and to chlorine-containing water or to chlorine, and in many cases also by good to very good fastness to light, high tinctorial strength and a good affinity in the dyeing according to the exhausting process.

Compared to known dyestuffs of similar constitution, for example those described in German Patents 138,902 and 1,077,812, the new dyestuffs are distinguished by considerably better fastness to wetting.

The following examples illustrate the invention but they are not intended to limit it thereto, the parts indicated being by weight unless otherwise stated, the relationship of parts by weight to parts by volume being that of the kilogram to the liter.

Example 1 217 parts of l-amino-2-hydroxybenzene-S-fl-hydroxyethylsulfone are introduced, while stirring, at room temperature, into 570 parts of concentrated sulfuric acid and the whole is stirred until complete solution. The mixture is then poured over 1500 parts of ice and diazotized at 5-10" C. with a solution of parts of sodium nitrate in parts of water. After addition of 1000 parts of water and 1500 parts of ice, the mixture is neutralized by slowly adding a total of 1000 parts of sodium bicarbonate. Thereupon, the temperature is allowed to rise slowly. When it reaches 20 C., the formation of foam is terminated. Then, parts of sodium salt of 1-(8'-hydroxy- 6' sulfo 2' naphthyl) 3 methyl-pyrazolone-(S) are introduced into this mixture, the pH of the mixture is brought to 9.0 by the addition of about 250 parts of anhydrous sodium carbonate and the Whole is stirred for some hours at room temperature until coupling is completed. The dyestuff is then salted out by means of potassium chloride and isolated by filtration with suction.

The dyestuff, which is obtained in the form of a dark violet-brown powder, dissolves in water to give a red violet solution and has as free acid predominantly the formula l HOaS-O-CHr-CHr-S O:

a part of the B-hydroxyethylsulfone-sulfuric acid ester groups having passed into the vinyl-sulfone group by the action of the alkali during the coupling reaction.

180 parts of dyestuflf thus obtained, having a strength of about 50%, are introduced into a solution of 50 parts of crystalline copper sulfate and 110 parts of crystalline sodium acetate in 1300 parts of water and the whole is heated for 1 to 2 hours at 80 C. After cooling, the dyestuff is separated by adding sodium chloride and then isolated. It constitutes a violet brown powder which dissolves in water to give a red brown solution and which dyes cellulose fibers in the presence of agents having an alkaline action red brown shades that have very good fastness to light, to washing, to chlorine-containing water and to chlorine. The dyestuff contains 2 atoms of copper per molecule.

If for metallization there are used instead of the indicated quantity of copper sulfate, 30 parts of crystalline cobalt sulfate, a dyestuif in the form of a black brown powder is obtained which dissolves in water to give a brown solution and which gives on cotton fabric full brown prints or pad dyeings that have good fastness to light and to wet processing and mean fastness to chlorine. Even on polyamide fibers, this dyestutf gives valuable brown dyeings and prints. The dyestufi contains 1 atom of cobalt per molecule.

Example 2 189 part of 1-amino-2-hydroxybenzene-5-sulfonic acid are introduced into 3800 parts of water and 300 parts of concentrated hydrochloric acid, whereupon the mixture is diazotized, at 5-10 C., with a solution of 70 parts of sodium nitrite in 110 parts of water. The excess of sodium nitrite is destroyed by adding a small amount of amidosulfonic aicid. Then, 342 parts of sodium salt of 1 (5'-hydroxy-'7'sulfo-1-naphthy1)-3-methylpyrazolone-(5) are introduced into the mixture thus obtained, the pH-valve of the mixture is brought to about 4.0 by the addition of sodium bicarbonate, 50 parts of crystalline sodium acetate are added and stirring is continued until coupling is complete. By adding 1000 parts of potassium chloride the yellow monoazo dyestufi of the formula is separated, filtered off with suction and then introduced, while stirring, into 2000 parts of water. 310 parts of the inner sulfate of 1-diazo-2-hydroxybenzene-S-B-hydroXyethylsulfone-sulfuric acid ester are added, the pH-value is brought to 9.0 by the addition of about 350 parts of sodium carbonate and the whole is stirred for several hours at room temperature until coupling is complete. The dyestufi is separated by the addition of sodium chloride and filtered off with suction. It constitutes a dark brown powder which dissolves in water to give a red brown solution and which corresponds predominantly to the formula I OH OH a small part thereof having the form of a vinyl-sulfone dye-stuff owing to the transformation of the B-hydroxyethylsulfone-sulfuric acid ester grouping into the corresponding vinyl-sulfone group by the action of alkali during the coupling reaction.

166 parts of the dyestulf thus obtained, having a strength of about 50%, are converted according to the method described in Example 1, into the copper complex dyestuff which contains 2 atoms of copper per molecule. It constitutes a dark brown powder which dissolves in water to give a red brown solution. In the presence of alkali, it dyes cellulose fibers from long liquors intense red brown shades which have very good fastness to wet processing and to light.

Example 3 320 parts of 1-(8'-hydroxy-6'-sulfo-2-naphthyl)-3- methylpyrazolone-(S) are introduced into 2500 parts of water. By slowly adding a total of 53 parts of anhydrous sodium carbonate the substance is dissolved in the form of its sodium salt. 308 parts of the inner sulfate of l-diazo- 2-hydroxybenzene-S-B-hydroxyethylsulfone sulfuric acid ester are then added, while stirring, a solution of sodium acetate having a strength of 20% by weight is then added dropwise until the mixture has a pH-value of 3.0. After further stirring for half an hour, 500 parts of potassium chloride are added and stirring is continued at room temperature until coupling is complete. From the initial solution, the monazo dyestuff of the formula separates in the form of a yellow brown precipitate which is isolated by filtration with suction.

21 parts of 1-amino-2-methoxybenzene-S-sulfonic acid are heated in 300 parts of water and 30 parts of concentrated hydrochloric acid until they are dissolved; the whole is then cooled and diazotized, at 10 C., by the dropwise addition of 17.5 parts of a sodium nitrite solution having a strength of 17.5% by weight. This mixture is then allowed to run into a suspension of parts of the above-described monoazo-dyestuif having a content of pure substance of about 70% in 500 parts of water. Thereupon, a total of 30 parts of sodium bicarbonate is slowly added until a pH of 7.0 is reached; stirring is then continued at room temperature until coupling is complete. Thereby, complete dissolution takes place. The disazo-dyestuff formed which corresponds to the formula is precipitated by the addition of sodium chloride. It constitutes a dark brown powder which dissolves in water to give a red solution.

170 parts of the dyestuffs thus obtained, having a strength of about 50%, are introduced into a solution of 25 parts of crystalline copper sulfate and 55 parts of crystalline sodium acetate in 1000 parts of water and heated for 1 hour at 80 C. The dyestuff is then precipitated by means of a mixture of potassium chloride and sodium chloride and filtered off with suction. It contains 1 atom of copper per molecule and constitutes a dark brown powder which dissolves in water to give a red solution. In the presence of agents having an alkaline action it gives on cotton or polyamide fabrics red brown prints which have good fastness to light and to wet processing.

Example 4 175 parts of 1-(8-hydroxy-6-sulfo-2'-naphthyl)- pyrazolone-(S)-3-carboxylic acid are suspended in a mixture of 3500 parts of water and 175 parts of glacial acetic acid. Thereupon, 92 parts of the inner sulfonate of 1-diazobenzene-4-su1fonic acid are introduced and the Whole is stirred at room temperature until coupling is complete; during that time complete dissolution takes place. The monoazo-dyestuff formed is separated in the form of orange coloured flocks by adding 500 parts of potassium chloride and isolated by filtration with suction.

The wet filter cake is dissolved in 3000 parts of water. A solution of diazonium salt, which has been prepared as described hereinafter, is allowed to run into this solution.

92 parts of 1-aminobenzene-4-vinyl-sulfone are dissolved in 300 parts of water and 125 parts of concentrated hydrochloric acid and diazotized at 510 C. with 100 parts by volume of a 5 N sodium nitrate solution.

The pH of the coupling mixture is brought to 6.5'7.0 by the addition of sodium bicarbonate and stirring of the mixture is continued until coupling is complete. The disazo dyestuif formed is separated by the addition of sodium chloride and isolated by filtration with suction. It constitutes a dark red powder which dissolves in water to give a yellow red solution and corresponds to the formula This dyestuff yields on cellulose or polyamide fibers and on wool orange brown dyeings and prints which have good fastness to wet processing and medium fastness to light.

A dyestufi having a similar shade and similar fastness properties is obtained when using for the first coupling, instead of the inner sulfonate of l-diazobenzenelsulfonic acid, the corresponding amount of the inner sulfate of the 1-diazobenzene-4-B-hydroxyethylsulfonesulfuric acid ester.

Example 5 The monoazo dyestuif prepared according to Example 4 in form of the wet filter cake is introduced into 3000 parts of water. 114 parts of the diazo-oxide of l-amino- Z-hydroxybenzene-S-fihydroxyethylsulfone are added, the pH of the mixture is raised to 9.510.0 by adding anhydrous sodium carbonate and the whole is stirred at room temperature until coupling is complete. Thereupon, the mixture is neutralized by dropwise introduction of hydrochloric acid having a strength of 20% and the disazo-dyestuff is salted out by means of 600 parts of potassium chloride. The isolated dyestuif constitutes a dark brown powder which dissolves in water to give a brown red solution and corresponds to the formula I HO-CHr-CHr-S O2 127 parts of this dyestuff, having a strength of about 60%, are slowly introduced, while stirring, into 635 parts by weight of concentrated sulfuric acid and the whole is stirred for several hours at room temperature until solution is complete. Thereupon, the mixture is poured, while stirring, on 1900 parts of ice, the esterified dyestuif is salted out by adding potassium chloride and filtered off with suction. The wet filter cake is then dissolved in 800 parts of water and neutralized with a small amount of sodium hydroxide solution, parts of a sodium hydroxide solution of 16% strength are then added dropwise, at room temperature, within some minutes, and the whole is stirred for a short time. The mixture is rendered weakly acid by the dropwise addition of hydrochloric acid having 20% strength and the dyestufi is separated by the addition of potassium chloride. The isolated dyestuff constitutes a dark brown powder which dissolves in water to give a brown red solution and which corresponds to the formula 125 parts of this dyestuflf, having a strength of about suction, washed with a sodium chloride solution having a 60%, are introduced into a solution of 25 parts of strength of 10% and dried. It corresponds to the formula crystalline copper sulfate and 55 parts of crystalline sodium acetate in 1000 parts of water and the whole is heated for about 1 hour at 80. After cooling, the dyestuff is precipitated by means of sodium chloride and filtered off with suction. It constitutes a dark brown powder which SOi-CHiCHi0H dissolves in water to give a dark red solution. It contains 1 atom of copper per dyestufi molecule. H

In the presence of alkali, the dyestulf gives on cellulose fibers red brown dyeings and prints which posses good N fastness to wet processing and to light. HO l;

170 parts by weight of sodium salt of 1-(5'-hydroxy-7'- sulfo-2'-naphthyl)-3-methyl-pyrazolone-(5) are dissolved in 2000 parts of water; thereafter, 230 parts of the diazo- 3 oxide of 1-amino-Z-hydroxybenzene-S-,B-hydroxyethyl-sulfone are added, while stirring. By dropwise adding a sodium hydroxide solution of 38 B., the pH-value of the mixture is brought to 12.0 and the Whole is stirred for several hours at room temperature until coupling is com- 80 Parts of the y having a Strength of about plete. The mixture is then rendered weakly acid to Congo e introduced into 300 parts of anhydrous py paper by dropwise adding hydrochloric acid having a after addition of 5 parts of urea, the whole is heated at strength of 20% and stirred until it becomes thinly liquid. 85 C. At this temperature, parts of amido-sulfonic It is then filtered off with suction, washed with a small acid are portion-Wise added and the Whole is heated for amount of dilute hydrochloric acid and dried. In this about 1 hour at l00-l05 C. After cooling, the mixture form, the dyestulf is only sparingly soluble in water. Upon is poured into 2500 parts of water, rendered weakly acid addition of alkali, it dissolves to give a red brown soluto Congo paper by the addition of hydrochloric acid tion and corresponds to the formula 30 having a strength of 20%, the precipitation of the dye- 200 parts of this dyestulf are slowly introduced, while stuff is completed by the addition of 200 parts of sodium stirring, into 1000 parts of concentrated sulfuric acid. chloride and the dyestulf is filtered off with suction. The Whole is stirred for several hours at 2530 C. until The sulfuric acid ester of the monoazo-dyestuff, obsolution is complete. The mixture is then poured, while tained in the form of an orange yellow powder, is identistirring, on 3000 parts of ice and the dyestutf is salted out cal with the monoazo-dyestulf described in Example 3. by the addition of potassium chloride. After filtration with By further coupling according to Example 3 with any desuction, the still strongly acid filter cake is eluted with a sired diazotized aromatic amines, further disazo-dyestutfs saturated sodium chloride solution, adjusted to the neumay be obtained. The esterification in pyridine can be tral point by cautious addition of sodium bicarbonate carried out in the same manner with the aid of chloroand then again filtered with suction. sulfonic acid at 30-40 C.

The dyestulf, which is now in the form of the di-(B- hydroxy-ethylsulfone-sulfuric acid ester), can be trans- Examp 1e 8 formed as described in Example 1 into the copper complex 0 parts of the monoazo-dyestuff, having a Strength of compound (with 2 copper atoms per molecule) and conabout 60% and described in Example 3, are introduced stitutes as such a. dark brown powder which dissolves in in o a Solution of 25 parts of crystalline copper sulfate water to give a dark red solution and gives on cotton or and 55 parts of crystalline sodium acetate in 800 parts staple fibers red brown dyeings having good fastness to of water, and the whole is stirred for 1 hour at 80 C. light and to wet processing. After cooling, the copper complex dyestuff that has Example 7 formed is salted out with sodium chloride, filtered off with suction and washed with a saturated sodium chloride p y y py are dissolved in solution. The wet dyestuif paste is then introduced into 500 parts of water. 31 parts of the inner sulfate of 1- 4000 parts of water, whereupon 150 parts of glacial acetic acid are added. Then, 228 parts of the diazo-oxide of ammo hydroxy 5 fi'hydroxyethylsulfone'sulfunc 1 amino 2 hydroxybenzene 5 fi hydroxyethylsulfone acid ester are added, the pH -value is brought to 7 .58. 0 are introduced, while stirring, and the whole is Stirred by the addition of sodium bicarbonate and the whole is for several hours at room temperature until coupling is 111ml 00111111118 p j The y complete. The monoazo-dyestuff which is obtained in the 1S precipitated by means of sodium chloride and filtered form of a yellow brown precipitate is filtered off with off; it constitutes a dark brown powder which dissolves 342 parts of the sodium salt of l-(8-hydroxy-6'-sulfoin water to give a red brown solution and corresponds to the formula lone-() are introduced into this mixture, the pH-value of the mixture is brought to 4.0 by slowly adding sodium 100 parts of this .dyestuff, having a strength of about 50%, are stirred for 1 hour at 80 C., in 500 parts of water with 6.5 parts of cobalt acetate. The dyestuff which precipitates after cooling is filtered off with suction. It constitutes a dark brown powder which dissolves in water to give a red brown solution and which gives on cotton or staple fiber fabrics full brown prints and dyeings that have good fastness to wet processing and to light. The dyestulf contains 2 atoms of copper and 1 atom of cobalt per 2 molecules.

Example 9 320 parts of 1-(8'-hydroxy-6-sulfo-2-naphthyl)-3- methyl-pyrazoloue-(S) are dissolved in 3000 parts of water by the dropwise addition of a sodium carbonate solution up to the neutral point. 644 parts of the inner sulfate of l-diazo-2-methoxybenzene-S-B-hydroxyethylsulfone-sulfuric acid ester are introduced, while stirring, the pH-valve of the mixture is brought to 6.5-7.0 by means of sodium bicarbonate and stirring is continued until coupling is complete. The dyestuff is precipitated by means of potassium chloride and constitutes a dark red powder which dissolves in water to give a yellow red solution. It gives on wool, in the presence of agents having an alkaline action, brick red dyeings that have good fastness to wet processing. The dyestuff has the formula bicarbonate, 80 parts of crystalline sodium acetate are added and the whole is stirred at room temperature until coupling is complete. The monoazo-dyestulf formed partly separates in the form of an orange coloured precipitate. By the addition of potassium chloride the precipitation is completed. The dyestuff is filtered ofi with suction and introduced as wet filter cake into 2000 parts of water. 300 parts of the inner sulfate of l-diazobenzene-4-fl-hydroxyethylsulfone-sulfuric acid ester are added thereto, the pH is brought to 6.0-6.5 by addition of sodium bicarbonate and the whole is stirred at room temperature until the second coupling is completed. By the addition of potassium chloride the vdisazo-dyestutf formed is separated and filtered off with suction. It constitutes a red brown powder which dissolves in water to give an orange brown solution and has the formula 160 parts of the dyestuff, having a strength of about are heated to the boil for about 20 hours in 1000 parts of water with 60 parts of crystalline copper sulfate, 70 parts of crystalline sodium acetate and 30 parts of glacial acetic acid. After cooling, the dyestufi is salted out with potassium chloride and filtered off with suction. The complex metal dyestufi that has formed contains 2 atoms of copper per molecule and has the same properties and the same formula as the copper complex compound described in Example 1.

Example 10 189 parts of 1-amino-2-hydroxybenzene-5-sulfonic acid are diazotized as described in Example 2. 320 parts of 163 parts of this dyestufif, having a strength of about 50%, are introduced into a solution of 48 parts of copper acetate in 1000 parts of water. As soon as the components are dissolved, the pH-value of the mixture is brought to 5.5-6.0 by the addition of a small amount of anhydrous sodium bicarbonate, 40 parts by weight of hydrogen peroxide having a strength of 15% are added dropwise, at 20-25 C., within about 2 hours, and the whole is stirred for some time at room temperature. The dyestutf is separated by means of potassium chloride and then 1 (8' hydroxy 6'-sulfo-2-naphthyl)-3-methyl-pyrazoisolated; it constitutes a grey brown powder which dissolves in water to give a red brown solution and corresponds to the formula Example 11 496 parts of sodium salt of 1.-(8'-p-toluene-sulfonylhydroxy 6-sulfo-2'-naphthyl)-3-methyl-pyrazolone-(5) are dissolved in 2500 parts of water. 184 parts of the inner sulfonate of 1-diazobenzene-4-sulfonic acid are introduced, while stirring, into this solution, 100 parts of anhydrous sodium acetate are added and the whole is stirred until coupling is complete. The monoazo-dyestuff precipitates from the yellow solution in the form of an orange coloured precipitate upon addition of a small amount of potassium chloride. The dyestuff is isolated by filtration with suction, the wet filter cake is dissolved in 5000 parts of water, 500 parts by volume of a sodium hydroxide solution of 38 B. are added and the whole is heated for a short time at 90 C., whereby the p-toluenesulfonyloxy group is hydrolysed. After cooling, the mixture is neutralized by means of concentrated hydrochloric acid, 310 parts of the inner sulfate of l-diazo-Z-hydroxybenzene-Sfi-hydroxyethylsulfone-sulfuric acid ester are added, while stirring, the pH-value of the mixure is brought to 8.5-9.0 by the addition of a small amount of anhydrous sodium carbonate and the whole is stirred at room temperature until the second coupling is complete. The mixture is then rendered weakly acid by dropwise addition of hydrochloric acid having a strength of The disazo dyestuif that has formed is precipitated by means of sodium chloride and filtered off with suction. It constitutes a dark red powder which dissolves in water to give a red solution. Upon addition of alkali the solution turns red violet. The dyestuff has the formula 1L i t I 170 parts of dyestuif, having a strength of about 50%, are introduced into a solution of 25 parts of crystalline copper sulfate and 55 parts of crystalline sodium acetate in 1000 parts of water, and the whole is heated for about 1 hour at C. After cooling, the dyestufi is precipitated by means of potassium chloride and filtered off with suction. It constitutes a dark brown powder which dissolves in water to give a dark red solution and which gives on cellulose fibers bordeaux-coloured dyeings and prints that have good fastness to wet processing and to light.

Example 12 312 parts of 1 amino-2-hydroxy-5-(N-ethionyl-N- methyl-amino)-benzene are diazotized, at 5-10 C., in 2000 parts of water and 250 parts of concentrated hydrochloric acid by the dropwise addition of a solution of 70 parts of sodium nitrite in parts of water. parts of sodium salt of 1-(8'-hydroxy-6-sulfo-2'-napthyl)- 3-methylpyrazolone-(5) are introduced into this mixture, the pH-value of the mixture is brought to 8.0 by the addition of sodium bicarbonate and the whole is stirred for several hours at room temperature until coupling is complete. The dyestutf is precipitated by the addition of potassium chloride and then isolated; it constitutes a dark brown powder which dissolves in water to give a brown solution and corresponds in the form of the free acid to the formula The copper complex dyestuif prepared from this dyestuff in the manner described in Example 1 contains 2 atoms of copper per molecule. It is a dark brown powder which dissolves in water to give a red brown solution and gives on cotton or staple fibers, in the presence of agents having an alkaline action, red brown dyeings and prints that have good fastness to washing, to chlorine and to light.

The corresponding cobalt complex dyestuif, which contains 1 atom of cobalt per molecule, gives on cotton or staple fibers neutral brown prints.

Example 13 160 parts of 1-(5'-hydroxy-7-sulfo-l'-naphthyl)-3 methyl-pyrazolone-(S) are suspended in 2500 parts by volume of water. 295 parts of the inner sulfonate of 4-(5- chloroproprionylamino)-1-diazo-benzene-2-sulfonic acid are introduced into this suspension, while stirring, the pH-value of the mixture is adjusted to the neutral point by the addition of sodium bicarbonate, whereupon complete solution takes place; stirring is then continued until coupling is complete. The dyestuff is separated by the addition of sodium chloride and separated by filtration with suction. It constitutes a dark red powder which corresponds to the formula 176 parts of the dyestutf, having a strength of about 50%, are introduced into a solution of 25 parts of crystalline copper sulfate and 55 parts of crystalline sodium acetate in 1500 parts of water and the whole is heated for 1 to 2 hours at 80 C. After cooling, the dyestufi": is salted out by the addition of sodium chloride. The dyestuff, which contains 1 atom of copper per molecule, constitutes a dark brown powder which dissolves in water to give a yellow brown solution and gives on cotton or staple fibers brown shades that have good fastness to washing and to light.

Example 15 600 parts of the inner sulfate of 1-diazo-benzene-4-B- hydroxyethylsulfone-sulfuric acid ester are introduced into a suspension of 270 parts of 1-(3'-hydroxy-4'-sulfo- 1'-phenyl)-3-methylpyrazolone-(5 in 3600 parts of water. The pH-value of the mixture is brought to 7.5-8.0, while stirring, by adding a small amount of sodium bicarbonate and the whole is stirred until coupling is complete. The diazo dyestuff that has formed is precipitated by the addition of potassium chloride and isolated by filtration with suction. It constitutes a dark brown powder which dis- The dyestuff dissolves in water to give a yellow red solution and gives on cellulose fabrics red brown prints and pad dyeings that have very good fastness to wet processing.

Example 14 63 parts of the monoazo-dyestuff, obtainable according to Example 3 or Example 7, and 26 parts of the inner sulfonate of 5 acroylamino-l-diazobenzene-Z-sulfonic acid are introduced, while stirring into 600 parts of water. The pH-value of the mixture is kept at 7.0 to 7.5 by the addition of a small amount of sodium bicarbonate, whereupon complete solution takes place. Stirring is continued until coupling is completed, the disazo dyestuif that has formed is precipitated by the addition of sodium chloride and filtered off with suction. The dyestuff constitutes a dark brown powder which dissolves in water to give a red brown solution and corresponds to the formula solves in water to give a yellow brown solution and corresponds to the formula The dyestuff gives on cellulose or polyamide fibers yellow brown dyeings or prints that have good fastness to wet processing.

l ii H0 N 11038 OH I l l l /O=O N=N N\ l N: -C a H033 similar good properties of fastness.

wool, silk or polyamide fibers dyeings and prints that have Diazo Components I. At the pyrazolone side of the azo II. At the naphthol side of the azo component component Coupling Component Metal Shade ethylsulfone-sulfuric acid ester. droxyethylsulfone suliuric acid ester. methyl-pyrazolone-(5).

do Ni do do Fe 1-i1lii1o-2-hydroxybenzene-S-sulfonic ..do do Cu D0 .do 1-(8-hydroxy-6-sulfo-2-naphthal)-3- C0 methyl-pyrazolone-(5).

D0 1-aminobenzene-3-fl-chloroethylsulfone- 1-(8'-hydroxy-6-sulfo-2-naphthyl)-3- Cu methylpyrazolone-(5). l-amino-Z-hydroxybenzene-S-B-hydroxy- 1-aminobenzene4-sulfonic acid do Cu ethylsulfone-suliurie acid ester.

Do l-zgrnno-Z-hydroxybenzene-5-sulionic do Cu D0 do do C0 D0 l-aminonaphthaline-Z-sulionie acid do Cu 1-amino-2-hydroxybenzene-4B-hydroxyl-amino-Q-hydriixybenzene-dfi hy- ..do Cu ethylsulione-sulfurrc acld ester. droxyethylsulfone-suliuric acid ester.

Do do do C0 D0 do do Cr 1-215 ino-2-hydroxybenzene-t-sulfonic d0 do Cu Do do do Co l-aminobenzene-4-B-hydroxyethylsull-aminobenzene-2-carboxylic acid-ii-B- l-aminobenzene-Qcarboxylic acid-S-fld0 Cu hydroxyethyl-sulionesulfuric acid hydroxyethyl-sultone-sulfuric acid ester. ester.

D0 do do Go Do do do Cr l-amino-2-nitrobenzenel-sullonic acid. 1-amino-2-hydroxybenzene-5-B-hy do Cu droxyethylsulfonesulfurie acid ester.

1-arnino-2-hydroxy-6-nitro-naphthalenedo do Cu 4sulfonic acid.

Do do do C0 D0 do do Cr Laminonaphthalenel-sulionic acid do 1-(8hydroxy-6-sulfo-2-naphthyl)- Cu pyraz0lone-(5)-3-carboxylic acid.

Do do do Co l-aminobenzeneA-sulionic acid l-aminonaphthalene-S-fi-hydroxydo ethylsulione-sulfuric acid ester.

l-amino-Z-hydroxybenzene-S-fl-hydroxy- 1-amino-2-hydroxybenzene-5-B-hy- 1(8-hydroxy-6-sulfo-2-napl1thyl)3- Cu ethylsulfone-sulfuric acid ester. droxyethylsultone-sulfurie acid phenyl-pyrazolone-(5) ester.

Do do do Co l-aminobenzeneA-B-hydroxyethylsul- .do 1-(8-hydroxy6-su1fo-2-naphthyl)- Cu Ione-sulfuric acid ester. pyrazolone-(5)-3-carb0xylic acid ethyl ester.

Do do ..do Co l-amino-Z-hydroxybenzene-5-B-hy- 1-amino-2-hydroxybenzene-fi-sulfonic acid. droxyethylsulione-phosphcric acid 1-(5 -hydroxy-7-sulfo-2-naphthyl) -3- Cu methylpryazolone-(5) ester.

D0 do do Co 1-arninobenzene-2-carboxylic acid l-arnin0-2-11ydroxybenzene-fi-fl-hydo Cu droxyethylsulfone-sulturic acid ester.

Do do do Go Do do do Cr l-amino-2-hydroxybenzene-5-sulionie .do 1-(5-hydroxy-7-su1fo-l-naphthyl)-3- Co acid. methyl-pyrazolone-(5) Do l-aminobenzene-4-B-hydroxyetliylsul- .do Co tone-sulfuric acid ester.

1-aminobenzene t-fi-hydroxyethylsuldo Violet brown.

Brown.

Olive brown.

Red brown.

Neutral brown.

Red brown.

Neutral brown.

Red brown.

Violetish brown.

Brown.

Currant.

Violetish red brown.

Brown.

Orange brown.

Red brown.

Yellow brown.

Neutral brown.

Bordeaux.

Dull red.

Red brown.

Violet brown.

Red brown.

Brown.

Brown red.

Red brown.

Neutral brown.

Red brown.

Neutral brown.

Red brown.

Violetish brown.

Neutral brown.

Brown.

Diazo Components I. At the pyrazolone side of the azo II. At the naphthol side of the azo component 7 component Coupling Component Metal Shade l-arninobenzene-3-B-hydroxyethylsull-amlnobenzene-3-B-hydroxyethylsuldo Orange brown.

ione-suliurie acid ester. lone-sulfuric acid ester.

l-arnino 2-hydroxybenzene-fi-sulfonle 1-amino-4-(N-methyl-N-ethionyl)- 1-(8-hydroxy-6-sulto2-naphthyl)-3- Cu Red brown.

acid. aminob enzene. methyl-pyrazolone-(S) 1-amino4-(N-methyl-N-vinylsul- -do Cu D o.

fonyl)-amino-benzene.

1-amino-4-aeroylamino-benzene ..do Cu Do.

1-arnino-2-methoxy-x-fl-ohloropropio- ..-..do Cu Do.

nylbenzene (obtained by the reaction of l-amino-2-methoxybenzenewith fi-chloropropionylehloride according to Friedel Crafts).

Do l-amino-4-,8-hydroxypropionyl-aminodo Cu Do.

benzene-sulfuric acid ester.

1-arnino-4-(N-rnethyl-N-fl-chloroethyl- 1-amino-4-(N-methyl-N-Behloroethyl- .-do Dark red.

sulionyD-aminobenzene. sulfonyD-aminobenzene. 1-amlno-2'hydroxybenzene-efi-hydroxy' l-aminobenzene--B-hydroxyethylsul- 1-(3hydroxy-4-sulio-l '-pl1eny1) -3- Cu Brown.

ethylsulfone-sulfurio acid ester. tone-sulfuric acid ester. methyl-pyrazolone-(5).

Do do ..do C0 D0.

l-aminobenzeneA-sulfonic acid .do ..do Yellow brown.

We claim: 2. The innermolecular 2:1 copper complex compound 1. A water-soluble disazo dyestuif of the formula of the disazo-dyestufi of the formula i HO N HO OH i l l /c=o N=N N\ N=C-CH3 HOaS HOaSO-CHr-CHn-S O2 R3-Al: N X Z Y 1; Lg M 3. The innermolecular 2:1-cobalt complex compound ll of the disazo-dyestuff of the formula I 1 o=o\ JH 1 13 /NliAf N=N-AI1 )-X Zl Ra-C=N 50311 L R1 n-1 wherein Ar is benzene or naphthalene, Ar and Ar;; each is benzene, naphthalene, mono-sulfo benzene, mono-sulfo naphthalene, mono-lower alkoxybenzene, mono-nitrobenzene, mono-sulfo-mono-nitrobenzene, mono-lower alkoxy- S()31-[ mono-nitrobcnzene or monosulfo-mono-chlorobenzene, -R is hydrogen or lower alkyl, R is lower alkyl, phenyl, -COOH or COO-lower alkyl, R is hydrogen, hydroxyl, carboxyl or lower alkoxy, X is sulfonyl or car- N bony], Z is B-chloro-ethyl, B-sulfatoethyl, B-phosphatono ethyl or vinyl, and n and m are integers from '1 to 2, on no I at least one m being 2, the substituents -R in Ar and 7 -OH in Ar being in o-position to the adjacent azo N=N -N groups, or the copper, nickel, cobalt, chromium or iron N=C-()ll complex compound of said disazo dyestuff, said complex H 35- compound having a molar ratio of metal to dyestuif of 1:1 or 2: l. noas-o-Hro-l-no-ozs 3,450,689 21 22 4. The innerrnolecular 1:1 copper complex compound of the disazo-dyestuff of the formula 6. The innermolecular 2:1 copper complex compound of the d'isazo-dyestuff of the formula 5. The innermolecular 2:1 copper complex compound References Cited of the disazo-dyestufi of the formula UNITED STATES PATENTS 803E 40 3,313,799 4/1967 Noll 260-160 H0 CHARLES B. PARKER, Primary Examiner.

| DONALD M. PAPUGA, Assistant Examiner. N H0 1% 45 US. Cl. X.R.

(5:6 260160, 310, 37, 163, 458; 841, 42, s1, s4 HO S-O-ClEh-OHa-f 0a N=CGI I3 HOsS- 50 OH OH 

